Disk brake



G. S.' LANE Jan. 2, 1934.

DISK BRAKE Filed Oct. 28, 1930 INVENTOR.; GEORGE S. LANE.

Patented Jan. 2, 1934 STATES DISK BRAKE George S. Lane, San Anselmo, Calif., assigner to Wallace Sheehan, San Francisco, Calif., as y trustee This invention relates to disk brakes.

An object of the invention is to provide a disk brake mechanism wherein a non-rotating brake disk is disposed at all times substantially in parallelism with a rotary, friction facing, and wherein the brake disk is offset relatively to the center of rotation of the friction'disk, and the disks being Ybrought intoV concentric relation to each other at the time'when frictional engagement is establishedY therebetween; in other words when the brake is inoperative the non-rotative and the rotative disks are eccentrically offset relatively to each other, and are brought into concentric alignment when the brake is'applied; such arrangement permits the use of rocking supports for the brake disk, which turn around their respective fulcrums when the brake is applied; the rocking supports being adjustably connected for synchronized movement and for equalized pressure, and a brake actuating mechanism being adjustably associated with each brake to allow the synchronization of all the brakes on a vehicle or the like.

Other objects and advantages are to provide disk brakes that will be superior in point of simplicity, inexpensiveness of construction, positiveness of operation, and facility and convenience in use and general efficiency.

In this specification and the annexed drawing, the invention is illustrated in the form considered to be the best, but it is to be understood that the invention is not limited to such form, because it may be embodied in other forms; and it is also to be understood that in and by the claims following the description, it is desired to cover the invention in whatsoever form it may be embodied.

The invention is clearly illustrated in the accompanying drawing wherein Figure 1 is a plan View of the brake mechanism constructed in accordance with my invention; the wheel being partly broken away.

Figure 2 is a side view of the disk brake.

Figure 3 is a rear end view of the disk brake.

Figure 4 is a sectional View of the disk brake, the section being taken on the line 4 4 of Figure 1.

Figure 5 is a vertical, sectional View of the brake, the section being taken on the line 5-5 of Figure 2. n

Figure 6 is a sectional view of the rocking lever connection, the section being taken on the line 6 6 of Figure 3; and

Figure 7 is a sectional View of the connection between the brake actuating mechanism and the lever connection.

In carrying out my invention I make use of a stationary axle 6. When used in connection with the rear wheels of certain vehicles the axle housing or other similarly fixed element is utilized. A wheel 7 rotates on the axle 6.

On the inner face of the wheel is disposed a friction disk 8, provided with a peripheral, annular flange 9. Opposite the friction disk 8 is disposed a brake disk 11, which latter is supported on a rocking, brake operating mechanism, denoted in general by the numeral 12, the said mechanism in turn being mounted on the axle 6, so as to render the brake disk 11 non-rotative.

The brake disk supporting mechanism includes a support plate 13 on the top and another plate le on the bottom of the axle 6. The plates 13 and 14 are opposite each other and are preferably in horizontal position. On the ends of the plates 13 and 14 are fixed bearing brackets 16, one adjacent each side of the axle 6. The bearing brackets 16 are so disposed as to accommodate rocking shafts 18 therein in parallelism with the friction disk 8, and at right angles to the plates 13 and 14.`

On the top end of each shaft 18 is secured a bell crank lever 19 by means of a rectangular shaft-head 21 fitting into a rectangular aperture in the lever 19. On the bottom end of each shaft 18 is a rocking arm 22. Each arm 22 has a rectangular recess 23 therein, into which iits a rectangular washer 24 held in place by a lock nut 26 threaded on the end of the shaft 18.

Each bell crank lever 19 has a rocking arm 27 thereof pivotally secured to the rear face of the brake disk 1l. The rocking arms 22 are also pivotally attached to the rear face of the brake disk 11. Thus four points of support are provided for the disk 11. The longer arm 28 of each bell crank lever 19 extends at an oblique angle to the shorter arm 27. The respective shorter arms V27 and rocking arms 22 are parallel with each other. It is to be noted that each of the arms 22 and 27 is pivotally secured to the disk 11 by means of a double lug or yoke 29 and a pin 31.

In order to apply the brake the longer lever arms 28 are to be moved around the fulcrum of the lever so as to swing the shorter arms 27 and the rocking arms 22 in the direction of the friction disk 8. The outer ends of the arms. 22 and 27 move both laterally and toward the disk 8, consequently the disk 11 is moved toward the friction disk 8 as well as across in front of the disk 8. 110

The disk 11 is so disposed that the center thereof is offset relatively to the center of rotation of the friction disk 8, so as to allow for the swinging movement of the arms 22 and 27. The ec- Centricity of the disk 1l relatively to the disk 8 is such that at the time the disk 11 is brought into contact with lthe friction disk 8, rit Iis .also lmoved toward the vcenter of rthe disk 8 and Einto concentric position therewith. To permit such movement of the disk 1l, the hole 32 in the center thereof is made larger than the diameter of tfthe round portion 33 of the axle 6 at said disk l1.

It is to be noted that the spacing between the brake disk 11 and the friction .disk .8 is .so :adjusted that axial advancement of the ihrake disk 1l toward the disk 8 is suiiiciently long to allow the transverse movement of the disk 1l into concentric relation with the 'disk'8. 'Thedisks 8 and 11 are concentric at the time of their .-frictiona-l engagement with each other. For the purpose .of efcient brake ffriction fa lining or 'facing .3;4 is provided on the face of the :disk l1 fopposite the friction 18. .The facing l.341as'well:as ithe face .of :the .disk 18 may be corrected iin the unan- 'ner described iin my copending applications :for friction brakes, :Serial .Number 377.314, filed July 10, 1929, and Serial Number-'.404;f89.,:tiled November 4, 1929..

'The ree ends fof the longer farms 42.8 of 'the bell Jcrank lleyers :are adjustably connected ito each .other to allow the equalization .of 4the throw :of the rocleing farms .222 :and 'A27 on iboth sides of the `brake disk 11. r@n the :free end fof ione .of 'the varms :28 is pivoted ia .clevis 36, .from which extends a threaded :connecting ebar :37 in the direction :of the (other .arm :28. On -the free zend :o'f the other arm v28 iis ipivoted .a yclevis 13.8. In the Lhnb .39 .of the 'clevis 3B i-is rotatably :disposed fa :bushing 4i, 'the ihead rflange 42 .of which =is -zcountersunk into .the iinner end yoi" the hub 35i. An .externally 'threaded end 43 .of the bushing 41 extends beyond the outer end jof the hub ;41 f to :receive a lock nut 44 thereon, which latter .is :secured in position by 'a .setsorew 46.. The bushing 4i ris :thus :held .against axial :displacement lby the 'rsa-.id .lock innt 44. The bushing is internally threaded at 47 `to 4receive the end of the threaded rod 37 therein. .A iam fnut 48 on the rod 37 fxes the rod 13.7.'-in ndjusted position. In order to adjust the *relative Aangular position tof the levers 19., ithe 'jaen Vnut yi8 is loosened, then by the nut 44 and ithe bushing '41 the l.clevis 38 tis :moved -on fthe rod 37 `toward -or :away om :the l.other fcl'evis .36, :de-

pending on the direction fin `which fthe bushing '41 is rotated.

:'On the vrod i3?? is disposed lan internally 'threaded adjusting nut 49., ihelfd in adjustedipositicm :by .'locknuts 5.1 at #the ioppos'ite ends theiseof. one side of the nut l@49 extend opposed lugs :52, 'provided with complemental :axial grooves F53 on :the `opposite inner faces thereof. The v:end of fa v`brake operating cable 54 is :inserted into the rgrooves v.53.. A :bolt 55 slidably :extends through `the lug adjacent the `head 'of v'the sbo'lt and :is

e threaded into the other Ilug 52. The bolt V:.55 iis .disposed between ithe free yends =of ithe lugs and the grooves 53. By tightening the bolt IE5 `the cable 254 is securely held iin the grooves 53. The cable '.54 is .disposed 'in ia flexible jacket .57 `which latter `in'turn -is .clamped :at 58 to thexpla'te 13. The .cable 54 is connected nto .a brake epedal or the like in `the fcustomaiyiinanner. The tightness vof the cable A5.4 :can be readily iadjusted by yloosening the nuts 5l and adjusting the adjust- .;ment nut 49 to n desired `.position on the rod In this manner equalization of a plurality of simultaneously acting brakes can be readily accomplished.

In operation the brake disk 11 is always parallel with the friction disk 8, and it is adjusted into such parallel position by the shortening or lengthening ofthe space between the clevis 36 -fand *the clevis ,38 iin the :aforedescribed manner. In order to apply the brake, a pull is exerted on the cable 54 causing the rod 37 and the clevis 36 zand 38 to move simultaneously. Thus the levers 19 are rocked, and all the arms 22 and 27 are turned in the direction of the friction disk 8. r@he brake :disk ..11 ysupported on the arms 22 and 27 is thus moved .into concentric frictional engagement withrtheidisk 8. The brake is released in the customary manner.

It `will be recognized that a particularly facile brake .mechanism is provided whereby a disk brake is eiectively applied to resist the rotary movement :tof fa wheel; iin connection with fautoinotiye vehicles the 'brakes yon :all .the wheels are .readily :synchronized and equalized =by the :aforementioned adjustments.

.Having thus vdescribed this invention, what I claim Aandiesire to secure by LettersJPatent is:

El. In Zcombination :a stationary member, a rotating member :associated with :the `stationary member; a friction disk related to the vrotary .member -to rotate therewith; .a :brake :disk operatively related :to 'the .friction disk; means asso- .ciatod with 'the stationary member to support .said ibreke Idisk in :an eccentric L.position :relatively -to the iriction disk; vsaid supporting means `:being :adapted ato move said :brake disk into frictional :engagement with the rstfdisk so that :the brake idisk `is iin substantially zcoaxial, parallel relation .tothe @rotary fdisk when :engaged therewith; and brake actuating .fmeens -adjustably .connected to `said supporting means to apply Ithe brake.

.2. `In combination :a stationary member, a -roiii-ating member associated `with Athe stationary member; a friction disk related to the rotary ,member -to rota-te therewith; va brake -disk oper- Aatively :related xto the friction disk; adjustable .means associated with ithe stationary member to :support `said brake .disk in an eccentric position relatively to the friction disk; said :supporting 'means fbeingedapted to move said brake `disk into frictional :engagement with the :rst disk so that :the `brake -disk is :in .substantially coaxial, vparallel :relation to x.the .rotary -disk when engaged therezwith; `and brake :actuating means connected to .said :supporting means ito apply lthe brake.

-3. ln combination a lstationary member., a vrotating member l.associated with :the stationary member; a friction disk related to the rotary .member `to rotate therewith; a brake :disk loperatively related to lthe friction disk; adjustable means 4associated with the stationary member to .supper-.t .said brake disk .in van ,eccentric `position relatively vto the .friction disk; .said .supporting means being adapted to move said .brake disk into frictiona'l engagement with the rst disk so that the brake disk 'is in substantially coaxial, parallel 1,

relation -tothe rot'ary disk when engaged therewith; and'brake actuating'means adjustably connected to said supporting means to apply the "brake` 4. The combination -With `a rotary element having a friction facing thereon, and a station- :ary memberrelated to said rotary element; of a friction .disk opposite 'said facing, means to nonrotatably support the disk in substantial paral- =.lelism=withithe facing andfbeing adaptedto move ist the disk toward and away from said facing transversely across the axis of rotation of the said element; and means to Aactuate said supporting means, said disk being initially so supported that its center is offset from the center of rotation of said element when the disk is inoperative, and is brought into concentric alignment with the said element and said facing when the brake is engaged.

GEORGE S. LANE. 

